Exchange 2003 rebooted on it's own - probable problem?

Hi all ye Experts...I've got here an Exchange issue
So, here's what happened.
Our Exchange Server rebooted by itself and the only thing the system event logs say after i boot the server up is "The previous system shutdown at 9:38:19 AM on 6/12/2008 was unexpected." and "The C: disk is at or near capacity. You may need to delete some files."

The Application log had these after booting up:

"The MTA is running recovery on the internal message database because the MTA was not shut down cleanly. This operation may take some time. Status updates will be written to the Windows 2000 Event Log. [DB Server MAIN BASE 1 0] (14) "

Do you think any of these indicate something is faulty with our Exchange Server?

Also - i deleted a DR Watson user.dmp file after the unexpected reboot because with that and the Exchange auto database backups it only left 300MB on the C: drive.
But there are also a couple large files that i'm wondering if i can safely delete as well...

C:\Documents and Settings\%username%\Local Settings\Temp\WER3d6b.dir00\store.exe.hdmp
and
C:\Documents and Settings\%username%\Local Settings\Temp\WER64cd.dir00\store.exe.hdmp
and
C:\WINNT\PCHEALTH\ERRORREP\UserDumps\store.exe.20080604-072638-00.hdmp
and
C:\Program Files\Exchsrvr\bin\TEMPINTEG3392.EDB
and
C:\Program Files\Exchsrvr\bin\TEMPINTEG1636.EDB

Hi again Ryansoto - thanks for the advice and comments, sorry for the confustion but my question does states where we were running short on space.

"Our Exchange Server rebooted by itself and the only thing the system event logs say after i boot the server up is "The previous system shutdown at 9:38:19 AM on 6/12/2008 was unexpected." and "The C: disk is at or near capacity. You may need to delete some files."

Sorry again for the clarity of my question but i wasn't trying to ask if i should delete some files and make space for exchange to run, but rather about the errors in the event logs that i posted and whether i could safetly delete the large files i listed that were on the c: drive.

My Questions:
Do you think any of these indicate something is faulty with our Exchange Server?
Anyone know if i can safely delete these?

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Hi, thanks for getting back to me again.
No, the Exchange db resides on the d: drive. We have no other databases on this server.
The 80GB ide mirrored drives in this server are partitioned out as follows:
c: 10GB
d: 54GB
e: 15GB

Do you have any thoughts on the errors that i posted?
We are planning to migrate to exchange 2007 in a few months using new hardware, but since we will be moving all the data over from this server, do you see any issues with that related to what is shown here?

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